Optical machines and apparatus; parts and accessories of optical machines; optical apparatus and instruments; photographic machines and apparatus; cinematographic machines and apparatus; prisms for optics purposes; optical lenses; optical filters; optical mirrors; optical reflectors; optical shutters; spectroscopes; optical condensers; microscopes; biological microscopes; metallurgical microscopes; stereomicroscopes; fluorescence microscopes; prisms for microscopes; lenses for microscopes; re...